Note 017 The tribuli are small engines with four spikes, one fixed in the ground, the three others erect or adverse, (Procopius, Gothic. l. iii. c. 24. Just. Lipsius, Poliorcetwv, l. v. c. 3.) The metaphor was borrowed from the tribuli, (land-caltrops,) an herb with a prickly fruit, commex in Italy. (Martin, ad Virgil. Georgic. i. 153 vol. ii. p. 33.)]

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The History Of The Decline And Fall Of The Roman Empire —Fall In The East —Chapter 43